def open_txt(file_name):
  with open(file_name,'r+') as f:
    while True:
      line = f.readline()
      if not line:
        return
      yield line.strip()

for text in open_txt('aa.txt'):
  print text

import datetime
import pickle

start = datetime.datetime.now()
print "start--%s" % (start)

fileHandle = open ( 'train.txt' )
file2 = open('s_train.txt','w') 

i = 1
while ( i < 10000 ):
  a = fileHandle.readline()
  file2.write(''.join(a)) 
  i = i + 1

fileHandle.close() 
file2.close()

print "done--%s" % ( datetime.datetime.now() - start)

if __name__ == '__main__':
  pass